Aon has agreed to acquire USI Insurance Services from KKR and its other shareholders for 17 billion dollars in cash, in a deal signed on 30 August 2026 and confirmed the following day. The transaction is subject to regulatory approvals and is expected to close in the fourth quarter of 2026.
USI is the tenth largest insurance broker in the United States, generating approximately 3 billion dollars in annual revenue and employing more than 10,500 people across close to 200 offices. The acquisition extends the buyer's push into the American middle market, following its 13 billion dollar purchase of NFP in 2024.
Aon expects to fund the acquisition entirely through new debt while remaining investment-grade rated, and projects 395 million dollars in annual run-rate net adjusted earnings before interest, tax, depreciation and amortisation from revenue and cost synergies across the combined middle-market platform.
For KKR the sale is a substantial realisation. The firm first backed USI in 2017 at a valuation of about 4.3 billion dollars and made three subsequent investments, and the exit is expected to deliver roughly 3.4 times the balance-sheet capital it invested.
The logic is scale in a fragmented market. Middle-market insurance broking in the United States remains highly fragmented, and the economics favour consolidators able to spread carrier relationships, data and specialist underwriting expertise across a larger book. Two large back-to-back acquisitions amount to a deliberate bet that the middle market, rather than the global corporate account, is where broking growth now sits.
The financing is the part to watch. Funding a purchase of this size entirely with debt raises leverage at a moment when integration risk is already elevated, since the previous acquisition is still being absorbed. Delivering the promised synergies will depend on retaining the producers, the client-owning brokers whose relationships are the actual asset being bought. Consolidation at this scale also concentrates the broking market further, which regulators and large commercial buyers will watch closely.
